turkey3_scratch :
Where is the evidence that they are encouraging people to trespass by assigning stuff to private property? Who says they aren't encouraging people to ask for permission to enter property? Niantic's has not verbally encouraged trespassing. Them "encouraging" it is your own interpretation NeilBlake and not something that can be solidified with proof and held up in the court of law.
Of there is a newspaper article about some private museum and how great is, and a bunch of people trespass and break into it the next day, did that newspaper encourage people to trespass and break in? Is it the newspaoer's fault? The only thing Pokemon go does is bring to light the REAL issues which is people and their poor choices.
They're not directly saying, "Hey, go jump somebody's fence to catch that Snorlax." The game itself explicitly states the opposite and obvious, to pay attention to surroundings and NOT trespass. But you can't discount human psychology. The nature of the gameplay, coupled with millions of younger (and some not-so-young) players with still-developing or underdeveloped senses of boundaries, and you get nuisance PokeGO players chasing Mons where they shouldn't be.
As stated before, Stops and Gyms are placed based on Ingress locations. The Mons themselves, though, can show up basically anywhere. So if you don't want them appearing somewhere in particular, that area has to be specifically excluded as a spawn zone. There's only so far you can get doing that algorithmically (that's a word, right?). And is there a mechanism to even do that? Deleting a Stop or Gym is easy. Blocking off a section of land, especially if it has to be done manually, is probably labor-prohibitive, given the possibly very large numbers of requests that could come.
Some posts have been talking about catching pixels like that makes the draw less relevant, but that misunderstands the reward system in the brain. It's pretty much the psychological equivalant of Niantic releasing Cake Go, where they drop slices of cake (or pie, chocolate, New York strip, or something else nominally delicious) randomly across the world, and then saying, "But don't bug private property owners about it." And then giving you points for eating the most different kinds of cake. The analogy breaks down a bit if you don't assume that the owners can't remove or eat the cake themselves, of course. People SHOULD heed that warning, but will they? Most, but not all. Niantic bears some responsibility for that. How much is up to the legal system. A class-action suit is a pretty bit stick to hit someone with, but as a property owner, I absolutely understand the desire to have something happen to resolve my issues right-damn-now.